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Recovery of Zinc by processing EAFD waste material

case-study-zinc-recovery-picElectric arc furnace dust (EAFD) is generated by Steel mills as a byproduct from production of steel. Steel mills use steel scrap as a main source of raw material. The EAFD material is either sent to landfill or sent for recycling to long distance destination. Due to low metal prices on the market and unjustifiable economics of the project at that particular time High Temperature Metal Recovery research and experimental development work was put on hold and eventually stopped. As result of metal price increase, customer decided to re-evaluate this project with objectives to build a demonstration plant, optimize the process and demonstrate the technological advancement to the steel industry. The metal recovery process contributes to experimental development in the field of metal recycling and environmental engineering. Customer made a decision to demonstrate a new metal recovery system which could be applied on site of Steel mills as part of their existing manufacturing system. It would result in elimination of transportation cost and environmental liabilities. The demonstration plant experimental work objectives were to optimize the recycling process of metal bearing raw material in the most economical way, with ability to meet specification for industrial applications of the final products and prove its capability to recycle/reuse metal bearing raw materials such as EAFD on site of the generator to eliminate disposal or high service charges. Developed technology is able to separate Zn, Pb and Cd from EAFD in a controlled environment and produce metal concentrate which meets specification for its reuse in metal refineries. The goals of demonstration plant was also to achieve highest efficiency of metal recovery process by establishing an optimum thermo-reaction parameters and hydrometallurgical regime including the amount and concentration of additives, the material feed rate, retention time of reaction, maximum temperature and optimum processing atmosphere.

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